> If you are using the standard operating system that came with your e280,
> that system only supports a 2 gig micro sd card. To the best of my
> knowledge Rockbox currently supports only a 16 gb micro sd card. Your
> formatting question is moot.
That's not entirely true. There are SDHC cards with up to 32GB of space,
and Rockbox will support any SD/SDHC card. So, unless the card is an
SDXC card (which I highly doubt), it should work.

While the Sandisk firmware of the original e200 series only supports SD
cards, the e200v2 firmware also supports SDHC cards.

> What do I do, so as to format the
> card. Should I do this from the computer - i.e, run Diskmgmt.msc in
> Windows XP, or is there a way to have the player do the formatting?
If you need to, you can certainly format it using diskmgmt.msc. Rockbox
won't be able to format the card, and the original firmware won't be
able to handle SDHC cards, at least if it's a v1 series device.

Do you need to format it at all? Usually those cards already have a
somewhat sane file system when they are sold.